AbstractSocial groups frequently engage in activities, which involve coordination of timing between group members. In many such activities, success depends on tightly synchronised timing. In some cases, for example, in rowing eights, timing is not the goal of the endeavour, yet each individual participant's timing is still closely linked to the timing of the group. In other cases, for instance small music group performance, timing is an explicit goal of the activity. In this talk, I will review a number of examples of coordinated multi-person timing and consider the question: how do participants in a group adjust their timing to each other